Fasting

Bukhari :: Book 3 :: Volume 31 :: Hadith 169

Narrated Tawus:

Ibn 'Abbas said, "Allah's Apostle set out from Medina to Mecca
and he fasted till he reached 'Usfan, where he asked for water and
raised his hand to let the people see him, and then broke the fast,
and did not fast after that till he reached Mecca, and that
happened in Ramadan." Ibn 'Abbas used to say, "Allah's Apostle
(sometimes) fasted and (sometimes) did not fast during the journeys
so whoever wished to fast could fast, and whoever wished not to
fast, could do so."